Memes aside, since I’ve been on the internet long enough to know that this could legitimately be the first time someone’s seen this information:
A brown recluse is a real spider endemic to the central United States. They are small, slender, and brown. Their bites are venomous and can require medical attention. In rare cases they can potentially be lethal, especially in young children.
People who don’t know about it because it’s not widely reported.